Apparatus for forming enchained stitching loops



Oct. 3, 1933. K. MAIER 1,929,323

APPARATUS FOR FORMING ENCHAINED STITCHING LOOPS Filed May 2-]., 1927 3 Sheets-Sheet l v Oct. 3, 1933.

K. MA

APPARATUS FOR FORMING ENCHAINED STI'I'CKING LOOPS Filed May 21, 1927 3 Sheets-Sheet 2' Qwntoz Oct. 3, 1933. K. MAIER v 1,929,323 APPARATUS FOR FORMING ENCHAINED STITCHING LOOPS Filed May 21,1927 3 Sheets-Sheet 3 All Patented Oct. 3, 1933,

'APPARATUS FOR FORMING ENCHAINED STITCHING LOOPS Karl Maier, Stuttgart, Germany, assignor to Union Special Maschinenfabrik, m. h. BL;

Stuttgart, Germany Application May 21, 192i, SerialNo. 193,272, and

in Germany June 5, 1926 dGiaims.

This invention relates to new and useful apparatus for forming enchained stitching loops, the object being to provide an apparatus for forming enchained stitching loops wherein the loops to be enchained are completely formed and subsequently interlocked one with another without the aid of the element forming the loops, or any element moving the material.

In the drawings which show by way of illustration one embodiment of the invention- Figure l is a view partly in section showing a portion of a sewing machine embodying my improvements;

Fig. 2 is a View partly in section showing the cloth plate and the stitching elements with the needle at the lower end of its stroke;

Fig. 3 is a similar view, but showing tht needig on its upwardmovement, and showing the previously formed thread loop as transferred from the retainer to the implement which removes the loop from the retainer and places it about the last-narned thread loop;

' Fig. 4 is view similar to Fig. 3, but showing the previously formed thread loop as completely removed from the retainer;

Fig. 5 is a view similar to Fig. i, but showing the implement which removes the thread loop from the retainer as having released thethread loop; a

Fig. 6 is a plan view of the elements beneath the 4 cloth plate positioned as shown in Fig. 3, the position of the needle also being shown in this Figurs;

Fig. 'l is a sectional view on the line A, B of Fig. 3;

Fig. 8 is a view of the cloth plate and stitching elements positioned as in Fig. 1, but showing a modified form of retainer support, and

Fig. 9 is a view. similar to Fig. 8, but showing also a modified form of the element for removing the thread loop from. the retainer.

The machine herein described is designed over the hooked end thereof.

(UL ire-res) through'an opening in the work support on which the fabric to he stitched is placed. Cooperating with the needle beneath the work support is a thread retainer having a hook-shaped end, and a recess in its under face. This hook-shaped fill retainer is in the form of a looper and is adapted to enter the loop formed by the needle as it starts on its upward movement and retains the needle thread loop. The needle then moves to the upper end of its stroke, and on the next stroke forms another loop, all the while the previously formed loop being held by the retainer. Before the retainer enters into the next loop thrown out by the needle, the element for removing the previously formed loop from the retainer moves into til the recess in the retainer and presents its hooked and through the previously formed loop and then moves downwardly so that said element on its backward movement may remove said previously formed loop from the retainer, carrying the same J5 Before it is-removed, however, the retainer enters the next formed needle loop and engages the same for retaining-it. The needle'moves to the upper end of its stroke. Thus, there are two completely 813 formed thread loops beneath the fabric, looth of which are around the retainer, and the needle point is above the material. The element which entered the previously formed loop withdraws the loop from the retainer and places it about the shank of the last-formed needle thread loop.

Inasmuch as the thread loops are interlocked by the cooperative action of the elements beneath the cloth plate, the needle plays no part in the interlocking or" the thread loops, except, oi course, that it holds the thread and draws on the thread in the setting of the stitches. Neither does the shifting-oi the fabric play any part in the placing of one thread loop on the other, and therefore, my improved method and apparatus is particularly adapted ior forming enchained stitching forgloops which may he used for darning; that is,

the purpose of forming thread loops in successiofi closing holes in bags and other types of articles,

one after another and passing the same through a fabric, or beneath the plane of the fabric for interlocking, and interlocking a previouslyiormed thread loop by a newly formed thread loop after the thread loops are completed, and without the aid of the implement which forms the thread 50 loops, or anymeans for moving the fabric in any particular direction. i In the preferred form of the invention. the stitch forming elements include a needle which is eye-pointed and provided with a thread. This 55 needle is reciprocated in a vertical line and passes wherein it is essential that the article he moved in any desired direction ior filling the hole with ice the connected enchained loops;

Referring more in detail to the drawings, 1 have shown a portion only of the work support or cloth plate 1 which is provided with a throat plate 3 having a needle opening 3 therethrough. The needle passes through this opening in thethroat plate. 'the needle is provided with a thread 5. The enchained thread loops are indicated at 6. These are of the usual character a s ng e thread chain stitch, and consist of indi- 11o vidual loops a a, a of which the loops a and a may be said to be completed stitches; that is,

they are enchained one with another and the loops drawn down to form the finished stitches. The loop a is still held-by the looper or retainer 7. This retainer is journaled at 8 and is oscillated on its support by means of a link 9. The link 9 is reciprocated in the usual manner, and it is not thought necessary to show in detail the mechanism for accomplishing this reciprocation of the link 9.

Cooperating with the looper or retainer 7 is a second loop-carrying element 11 which might also be referred to as a looper. This thread carrying element 11 is pivoted at 10 to a lever support 14 which is journaled intermediate its ends at 13. This lever support is provided with a ball stud 15 which is connected to an eccentric strap 17 cooperating with an eccentric on the shaft 16. As the shaft 16 rotates, itwill rock the lever 14, and this will raise and lower bodily the thread carrier 11. The thread carrier 11 is oscillated on its pivotal support 10 by alink 12, which is reciprocatecf by any suitable means. The looper or retainer "I is provided with a recess 18 in its under face which extends from the extreme front end thereof well back along the shank of the retainer. The looper or retainer '7 is also provided with a downwardly extending projection 19 forming a hook for retaining the thread loop on the retainer. The thread carrier 11 is provided with a notch 20 forming a finger 21 which is adapted to enter the thread loop for removing the same from the looper or retainer 7.

Starting with the parts positioned as shown in Mg. 1, there is a previously formed thread loop on the looper or 'retainer 7, and the needle is well down toward the lower end of its stroke. As the needle rises, a thread loop will be thrown out, of the usual character, and the looper or retainer 7 enters this thread loop. Prior to the looper or retainer 7 entering the newly formed thread ioop, the thread carrier 11 moves forward, and at a proper elevation, so that the finger 21 will enter the thread loop a This finger enters the recess 18, and therefore, the loop a which encircles the looper is held open for the finger toenter, and the finger will positively enter said loop a placing the bite of the loop in the notch 20 of the thread ca ying element 11. While the loop retainer '7 is still forward, the thread carrying element 11 moves downward, and this will position the thread loop a so that it may be readily removed from the looper-or retainer 7 and carried over the hooked end 19 on said retainer.

Meanwhile, the needle has proceeded on its upward movement, and there are two thread loops and a about the retainer 7. The needle point is well above the material, and while the needle i point is above the material, the loop retainer and the loop carrying element move to the positions shown first in Fig. 4, and then in Fig. 5. As the thread carryingelement moves to the positionshown in Fig. 4, it strip or remove the thread loop a entireLv from the retainer, placing it about the shank of the loop a, and then it releases said loop and the loop can be drawn up to' form the stitch.

Instead of describing the loop 03' as removed from the looper or retainer '1, it may well be said that the thread carrying implement 11 holds the is that the thread loop'a shall be secured or locked by the newly formed thread loop :1

It is noted that this removing of the previously formed loop from the loop retainer and placing it around the shank of the newly formed loop, occurs while the needle is up, and the needle, in no way, cooperates with the interchaining of the thread loops, except, of course, that it holds the thread. Furthermore, inasmuch as the thread loops are interchained positively by the cooperation of the elements 7 and 11 beneath the cloth plate, the direction of movement .of the fabric plays no part in the enchaining of the thread loops. The fabric may be moved forward, backward, to the right or to the left, and in fact, in any direction, and it doesnot in any way interfere with the enchaining of the thread loops. Thus it is that the stitching mechanism which I have provided is of great advantage in darning holes in fabrics, or in performing any other character of work where it is desired to feed the material manually and control the direction of movement of the fabric at will.

In Figures 8 and 9, I have shown a slightly modified form of means for manipulating the retainer. In Figures 1 to 5, the retainer oscillates in a fixed path back and forth, while in Figures 8 and 9, the retainer moves in a straight line back and forth. Said retainer is carried by the support which reciprocates in a supporting lug carried by the cloth plate or frame of the machine. In Fig. 9, I have shown a similar form of support for the retainer, and a modified form of support for the thread carrying element. The body portion of the threadcarrying element is substan tially horizontal, and it may be moved by a suitable mechanism horizontally and vertically for carrying out the movements given to the thread carrying element 11, as' shown in Fig. 1.

It is obvious that minor changes in the details of construction and the arrangement of the parts may be made without departing from the spirit of the invention as set forth in the appended claims.

Having thus described the invention, what I claim as new and desire to secure by Letters- Patent, is-

1. A stitch forming mechanism including a work support, a needle for forming needle thread loops and passing the same through the work support, a looper having a hook-shaped end for entering the needle thread loop and retaining the same, a loop carrying implement having a hookshaped end adapted to engage the thread loop carried by the looper and hold the same while the looper enters the next formed needle thread loop and carries the same through the previously formed loop held by the loop carrying implement.

2. A stitch forming mechanism including a work support, a needle for forming needle thread loops and passing the same through the work support, a looper having a hook-shaped end for entering the needle thread loop and retaining the same, a loop carrying implement having hookshaped end adapted to engage the thread loop carried by the looper and hold the same while the looper-enters the next formed needle thread loop and carries the same through the-previously formed loop held-by the loop carrying implement, said looper having a recess in its under face into which the hooked end of the loop carrying implement is adapted to move for engaging the thread loop on the looper.

3. A stitch forming mechanism including a work support, a needle for forming thread loops and passing the same through the work support, a

looper, actuating means for causing said looper to enter the needle thread loop and retain the same while the needle is forming its next thread and passing the same through the work support, a looper, means for oscillating said looper to cause the same to enter a needle thread loop and retain the same, a second looper and means for oscillating said second looper and for raising and lower ing the same, whereby said second looper is caused to engage the needle thread loop on the first looper and retain the same while the first looper enters the next formed needle thread loop and is retracted from said first formed needle thread loop carrying said second needle thread loop through the first formed needle thread loop.

KARL MAER.

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